Is there something odd about block 17664?

17664   2013-04-24 08:15:04   0:27:03   2742161   99   0.00005715   none   232879   25.28148024    confirmed

Had about 500MH/s on the pool at the time, and I checked on my backup pools that I didn't get any shares submitted around that time.

With those 99 shares I'd expect about 15x that reward.. something gone wrong?

I also had a reduced reward on block 17662